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Show 450 MR. G. A. BOULENGER O N TWO N E W [June 3, 22. SCOPOPHORUS, sp. inc. a. Skin without label, too young for determination. 23. MANIS TEMMINCKII, Smuts. a. Mandera. 3/90. Collected by Lieut. Langheld. 1 This specimen appears to have an unusually long tail, but as some of the terminal caudal scales have been lost, the exact extent of the variation cannot be recorded. 4. Descriptions of two new Species of the Siluroid Genus Arges. By G. A. BOULENGER. [Received May 28, 1890.] (Plate XLI.) Leaving aside the two or three species in which a spine is present between the rayed dorsal fin and the caudal, whether exposed and supporting the small adipose fin or partly embedded in the skin, and for which the name Stygogenes, Giinther, m a y be retained, I find, upon examination of the material in the British Museum and after perusal of Dr. Steindachner's descriptions, that as many as six species of the genus Arges are entitled to distinction. They may be easily identified by means of the following synopsis :- A. First ventral ray about as long as its distance from the posterior extremity of the anal laid against the tail, reaching or nearly reaching Ihe anus. a. Barbel half the length of the head. Eye equally distant from posterior nostril and upper border of gill-opening; outer pectoral ray reaching but a little beyond the base of the outer ventral ray 1. prenadilla, C. & V. Eye nearer the upper border of the gill-opening than to the posterior nostril; outer pectoral ray reaching nearly the extremity of the outer ventral ray 2. longifilis, Stdr. b. Barbel one third or one fourth the length of the head; eye nearer the upper border of the gill-opening than to the posterior nostril 3. sahalo, C. & V. B. First ventral ray exactly as long as its distance from the anal; anal opening nearly equally distant from the extremity of the ventral and the origin of the anal, or a little nearer the former. a. Barbel half the length of the head. Eye equally distant from posterior nostril and upper border of gill-opening; outer pectoral ray not reaching the middle of the outer ventral ray 4. whymperi, sp. n. Eye nearer the upper border of the gill-opening than to the posterior nostril; outer pectoral ray reaching beyond the middle of the outer ventral ray 5. taczanowskii,so. n. ... Barbel one third the length of the head; eye nearer the upper border of the gill-opening than to the posterior nostril 6. peruanus, Stdr. |
